非实体
发表于 2025-3-25 05:47:44
Gro Kvåle,Charlotte Kiland,Dag Olaf TorjesenThis chapter introduces some important space-times of general relativity, then describes their kinematics, Einstein’s field equations and energy conditions. Subsequently, it provides characterizations and classifications of space-times (in general, Lorentzian manifolds) that admit conformal (including Killing and homothetic) vector fields.
不能平静
发表于 2025-3-25 10:15:31
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对手
发表于 2025-3-25 14:52:13
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谷类
发表于 2025-3-25 17:59:27
Ronald Barnett Prof., Ph.D., D.Lit.This chapter starts with Yamabe problem, and then describes the Yamabe flow and Yamabe solitons. Finally, it provides characterizations of Yamabe almost solitons and also contact metrics as Yamabe solitons.
intelligible
发表于 2025-3-25 22:54:13
Lie Group and Lie Derivative,This chapter begins with a brief review of Lie groups and their Lie algebras. Subsequently, it introduces the notion of the Lie derivative, its properties and closes with formulas showing the deviation from commutativity of Lie and covariant derivatives.
大漩涡
发表于 2025-3-26 03:10:23
Conformal Vector Fields,This chapter is devoted to conformal Killing vector fields, their integrability conditions, their zeros and Lichnerowicz conjecture on semi-Riemannian and CR manifolds.
Temporal-Lobe
发表于 2025-3-26 07:08:47
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臆断
发表于 2025-3-26 08:53:10
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Figate
发表于 2025-3-26 15:31:14
Ricci Solitons,This chapter provides the basic theory of Ricci flow, Ricci solitons, their examples, important properties and known results.
Asperity
发表于 2025-3-26 18:16:26
Ricci Almost Solitons and Generalized Quasi-Einstein Manifolds,This chapter gives a coverage on Ricci almost soliton and its characterization and classification when it is compact, or contact metric. Next, it describes Generalized quasi-Einstein manifolds, its properties and classifications under various geometric conditions.